Messages in this thread |  | | | Date | Mon, 9 Nov 2009 12:37:37 +0530 | | From | Balbir Singh <> | | Subject | Re: [PATCH 2/2] memcg : rewrite percpu countings with new interfaces |
* KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-11-06 17:55:45]:
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > Now, alloc_percpu() alloc good dynamic allocations and > Recent updates on percpu.h gives us following kind of ops > - __this_cpu_add() etc... > This is designed to be a help for reduce code size in hot-path > and very useful to handle percpu area. Thanks for great works. > > This patch rewrite memcg's (not-good) percpu status with new > percpu support macros. This decreases code size and instruction > size. By this, this area is now NUMA-aware and may have performance > benefit. > > I got good result in parallel pagefault test. (my host is 8cpu/2socket) > > before== > Performance counter stats for './runpause.sh' (5 runs): > > 474070.055912 task-clock-msecs # 7.881 CPUs ( +- 0.013% ) > 35829310 page-faults # 0.076 M/sec ( +- 0.217% ) > 3803016722 cache-references # 8.022 M/sec ( +- 0.215% ) (scaled from 100.00%) > 1104083123 cache-misses # 2.329 M/sec ( +- 0.961% ) (scaled from 100.00%) > > 60.154982314 seconds time elapsed ( +- 0.018% ) > > after== > Performance counter stats for './runpause.sh' (5 runs): > > 474919.429670 task-clock-msecs # 7.896 CPUs ( +- 0.013% ) > 36520440 page-faults # 0.077 M/sec ( +- 1.854% ) > 3109834751 cache-references # 6.548 M/sec ( +- 0.276% ) > 1053275160 cache-misses # 2.218 M/sec ( +- 0.036% ) > > 60.146585280 seconds time elapsed ( +- 0.019% ) > > This test is affected by cpu-utilization but I think more improvements > will be found in bigger system. >
Hi, Kamezawa-San,
Could you please post the IPC results as well?
-- Balbir
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